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  <title>十六进制转换为十进制</title>
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  <div id="layout-content"><div id="function.hexdec" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">hexdec</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">hexdec</span> &mdash; <span class="dc-title">十六进制转换为十进制</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.hexdec-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>hexdec</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$hex_string</code></span>
   ) : <span class="type"><a href="language.pseudo-types.html#language.types.number" class="type number">number</a></span></div>

  <p class="para rdfs-comment">
   返回与 <code class="parameter">hex_string</code>
   参数所表示的十六进制数等值的的十进制数。<span class="function"><strong>hexdec()</strong></span>
   将一个十六进制字符串转换为十进制数。
  </p>
  <p class="para">
   <span class="function"><strong>hexdec()</strong></span> 会忽略它遇到的任意非十六进制的字符。
    </p>
   </div>

   <div class="refsect1 parameters" id="refsect1-function.hexdec-parameters">
    <h3 class="title">参数</h3>
    <p class="para">
     <dl>

      
       <dt>
<code class="parameter">hex_string</code></dt>

       <dd>

        <p class="para">
         要转换的十六进制的字符串
        </p>
       </dd>

      
     </dl>

    </p>
   </div>

   <div class="refsect1 returnvalues" id="refsect1-function.hexdec-returnvalues">
    <h3 class="title">返回值</h3>
    <p class="para"> <code class="parameter">hex_string</code> 十进制的表示
    </p>
   </div>

   <div class="refsect1 changelog" id="refsect1-function.hexdec-changelog">
    <h3 class="title">更新日志</h3>
    <p class="para">
     <table class="doctable informaltable">
      
       <thead>
        <tr>
         <th>版本</th>
         <th>说明</th>
        </tr>

       </thead>

       <tbody class="tbody">
        <tr>
         <td>4.1.0</td>
         <td>
          PHP 4.1.0
          开始，该函数可以处理 <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> 大数字，这种情况下，它会返回 <span class="type"><a href="language.types.float.html" class="type float">float</a></span> 类型。
         </td>
        </tr>

       </tbody>
      
     </table>

    </p>
   </div>

   <div class="refsect1 examples" id="refsect1-function.hexdec-examples">
    <h3 class="title">范例</h3>
    <p class="para">
     <div class="example" id="example-4129">
      <p><strong>Example #1 <span class="function"><strong>hexdec()</strong></span> 例子</strong></p>
      <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"See"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"ee"</span><span style="color: #007700">));<br /></span><span style="color: #FF8000">//&nbsp;both&nbsp;print&nbsp;"int(238)"<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"that"</span><span style="color: #007700">));&nbsp;</span><span style="color: #FF8000">//&nbsp;print&nbsp;"int(10)"<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"a0"</span><span style="color: #007700">));&nbsp;</span><span style="color: #FF8000">//&nbsp;print&nbsp;"int(160)"<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
   </div>

   <div class="refsect1 seealso" id="refsect1-function.hexdec-seealso">
    <h3 class="title">参见</h3>
    <p class="para">
     <ul class="simplelist">
      <li class="member"><span class="function"><a href="dechex.html" class="function" rel="rdfs-seeAlso">dechex()</a> - 十进制转换为十六进制</span></li>
      <li class="member"><span class="function"><a href="bindec.html" class="function" rel="rdfs-seeAlso">bindec()</a> - 二进制转换为十进制</span></li>
      <li class="member"><span class="function"><a href="octdec.html" class="function" rel="rdfs-seeAlso">octdec()</a> - 八进制转换为十进制</span></li>
      <li class="member"><span class="function"><a href="base_convert.html" class="function" rel="rdfs-seeAlso">base_convert()</a> - 在任意进制之间转换数字</span></li>
     </ul>
    </p>
   </div>

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